Known bugs
Known bugs
The bugs published on this page are mainly computational bugs that affect the calculation results. For each bug there is a plan for when the bug will be fixed.
As a service to our customers we sometimes make a patch for a bug. We do not publish these patches on this page. To get access to a patch, please contact our support. The patches might not always be well tested and should only be installed by customers experiencing the specific problem that the patch fixes.
Bug fix version
With certain intervals we collect fixed bugs into a Bug fix version that is installed in the same way as a new version. A Bug fix version has a four digit version number, e.g. 5.0.0.1, and includes fixes for both computational bugs and other bugs.
Detailed window model: For a switchable glazing with more than two states, only the states with lowest and highest transmittance, corresponding to control signal 1 and 0, work as intended. A control signal in between one and zero for the switchable glazing is treated as zero, which then gives the brightest state instead of an intermediate state.
Introduced in IDA ICE 5.1
Fixed in IDA ICE 5.2
In models using Advanced Heating/Cooling Distribution Systems with multiple water circuits, Active Beam and Swegon Beam room units incorrectly remain connected to the default heating and cooling circuits, regardless of the circuit assignment specified by the user.
Workaround: Adjust the order of the water circuits so that the circuits intended for Active Beam and Swegon Beam units are configured as the default heating and cooling circuits. Other room-unit types should then be assigned to the remaining circuits as needed.
Introduced in IDA ICE 5.0
Fixed in IDA ICE 5.2
Windows File Explorer: A recent update to Windows is causing IDA ICE to crash when File Explorer is opened, for example when using “Save As…”, “Open…”, or “Import CAD”.
Workaround:
- Delete DLL files "msvcp140.dll" and "vcruntime140.dll" from the folder "bin" in the IDA ICE installation folder. For example "C:\Program Files (x86)\IDA\bin"
- Test if IDA ICE is functioning as intended.
- If IDA ICE continues to crash:
Go to Latest supported Visual C++ Redistributable downloads | Microsoft Learn and install the X64 Redistributable package.
Introduced in IDA ICE 5.0
Fixed in IDA ICE 5.2
Generic free standing PV: When using Generic free standing PV, shading from large imported CAD objects may not be applied correctly. In affected cases, the PV production is calculated without considering shading from the imported object, although shading animation looks correct. The issue may occur after reopening the model, even if the shading was initially working.
Introduced in IDA ICE 4.5
Fixed in IDA ICE 5.2
Sending project files to Support: In Outlook 2024, issues have occurred when sending project files to EQUA support - emails are not always delivered successfully.
Workaround: Instead of using the built-in email function, users should follow these instructions.
All versions of IDA ICE are affected
Schedule: Schedules with many and/or complex rules applied at different time points may cause the program to crash or become unresponsive when generating diagrams or reports.
Introduced in IDA ICE 5.1.1
Fixed in IDA ICE 5.1.1.1
IDA ICE startup crash with SentinelOne on Windows 11: There is a known issue where Sentinel Agent, part of the SentinelOne anti-virus software, may cause ida-ice.exe to crash during the startup of IDA ICE. This occurs because Sentinel Agent injects itself as a DLL, which then attempts to access a null pointer. So far, this issue appears to be limited to Windows 11 (specific versions affected are currently unknown).
Workaround: Add an exclusion for ida-ice.exe in SentinelOne to prevent the crash.
Note: This does not appear to be Sentinel Agent flagging IDA ICE as malicious. Instead, it is caused by a problem in Sentinel Agent’s DLL injection behavior, which is outside of our control.
All versions of IDA ICE are probably affected
Tilläggsmodulen Miljöbyggnad: I tilläggsmodulen Miljöbyggnad aggregeras inte betyg, om flera våningsplan valts, i enlighet med Miljöbyggnadsmanual 4.0 (samt 3.1 och 3.2). Aggregeringen i tillägget följer just nu manual 3.0 oavsett vald version i rull-listan. Detta innebär att betyget för indikatorerna Solvärmelast, Termisk komfort sommar och vinter samt Dagsljus (för IDA ICE version 4.8) kan höjas två steg från lägsta rumsbetyget vilket inte är korrekt.
Introduced in Miljöbyggnad Extension 1.08
Fixed in Miljöbyggnad Extension 5.1.1
Detailed window: When a window includes integrated exterior shading, the Maximum solar gain (variable Qsolar) is slightly overestimated. This value is also used as “Indikator 2” (Solvärmelast) in the Miljöbyggnad extension. For a model with the window/floor area ratio = 0.15 and the window frame fraction = 0.1, the error is in the order of 1 W/m2.
Introduced in IDA ICE 4.8 SP1
Fixed in IDA ICE 5.1.1
Roof window/PV panel: External shades and shading objects (but not integrated window shadings) are disregarded by a window or a PV panel in/on a vertical (90°) roof part wall.
Introduced in IDA ICE 4.5
Fixed in IDA ICE 5.1.1
Photovoltaics:
- PV AC panel (PVmicroInverter): The series resistance is calculated incorrectly when the operating conditions deviate from the standard test conditions. This results in an error in the voltage calculated by the one-diode model, and an error in the produced power of up to 5% in a full year simulation.
- PV panel with Tigo optimizer, I-V for each module is optimized (PVstrModOpt): Errors in the calculation of parameters and variables in the one-diode model leads to incorrect yearly production from the PV. This can lead to overestimation of the power in partially shaded conditions; without significant shading the yearly production may be overestimated by up to 15%, with significant shading the error may exceed 30%.
Introduced in IDA ICE 5.0
Fixed in IDA ICE 5.1.1
Hot object: When a model, which has a hot object with imported geometry, is built and simulated, the results are initially ok. However, the z-coordinate of the hot object is wrongly set to be equal to the size of the object in the y-direction. If the 3D view is refreshed, the hot object is translated accordingly along the z-direction. If the model is built and simulated again, the results are wrong as the hot object has been relocated.
Introduced in IDA ICE 5.0
Fixed in IDA ICE 5.1
Roof window: If a zone has an inclined (> 10°) roof window (e.g. in an atrium) the distribution of the transmitted direct radiation to the different zone surfaces may in some cases become incorrect. This is most likely to happen if the zone height is low compared to the width or length and the inclination of the roof is low.
Introduced in IDA ICE 4.0
Fixed in IDA ICE 5.0.0.1
Energy balance diagram/table: “Infiltration and Openings” by mistake also includes energy from Fancoils and Reheat coils, if used. A correction can be made by subtracting the corresponding energies, shown in the Detailed energy balance diagram/table.
Introduced in IDA ICE 5.0
Fixed in IDA ICE 5.0.0.1
PV DC panels: The inverter can produce electrical energy when there is no irradiation on the pv-panels. The produced electricity can be overestimated by approximate 10%, depending on the simulated case. This does not affect the PV AC panels.
Introduced in IDA ICE 5.0
Fixed in IDA ICE 5.0.0.1
Energy balance diagram/table: “Infiltration and Openings” by mistake also includes energy from “Thermal bridges”. A correction can be made by subtracting the corresponding values of “Heat from thermal bridges” in the Heat balance diagram/table.
Introduced in IDA ICE 5.0
Fixed in IDA ICE 5.0.0.1
Leaks/openings between zones: If a leak is inserted in the ceiling of the bottom zone and another in the floor of the top zone, the air exchange between the two zones may become overrated. Smaller differences in air exchange between two zones may also occur depending on in which zone the leaks or an opening is inserted.
Introduced in IDA ICE 4.0
Fixed in IDA ICE 5.0
Localization Switzerland: In the zone templates according to SIA 2024:2021, the schedule of equipment outside operating hours is not correct.
Introduced in Localization Switzerland 4.8.0.2
Fixed in Localization Switzerland 5.0
Floor heating/cooling: If a floor with floor heating/cooling is connected to the ground, the floor heating/cooling layer is immersed in the construction "External constructions" instead of "Constructions toward ground". If these constructions are different the heat transmission through the floor can be over- or underestimated.
Introduced in IDA ICE 4.8
Fixed in IDA ICE 5.0
Anpassning Sverige: För BBR-versionerna 21-28 redovisas ett för högt U-värde för ytor mot ouppvärmda zoner eftersom det tillkommande värmemotståndet från den ouppvärmda zonen inte medräknas. BBR-version 29 beräknas korrekt. Dessutom medräknas luftläckaget felaktigt om det finns en öppen dörr mellan uppvärmda och ouppvärmda zoner vilket leder till ett för högt U-värde för den gemensamma konstruktionsdelen. Detta fel gäller alla BBR-versioner.
Introduced in Localization Sweden 4.8.0.2
Fixed in Localization Sweden 5.0
Detailed window: When the inner window of a ventilated construction is opened and the floor of the ventilated construction is above ground level, the pressure outside the window is set too low, which may affect the air exchange depending on the existence of other leaks or openings in the zone to the outside or to other zones.
Introduced in IDA ICE 4.0
Fixed in IDA ICE 5.0
For internal mass (furniture, convective internal mass, extra wall mass), the calculated heat capacity is less than set in the construction. The effect of this is negligible in most cases but can for settings of large mass heat capacities damp the room air temperature swing too little and lead to a slight overestimation of heating and cooling.
Introduced in IDA ICE 2.0
Fixed in IDA ICE 5.0
When using an AHU with enthalpy wheel there is no cold recovery of the exhaust air. This may lead to an overestimation of the cooling load.
Introduced in IDA ICE 4.8
Fixed in IDA ICE 5.0
Detailed window: For a window with a micro lamella shading placed on a roof or other non-vertical surface the solar transmittance may be underestimated.
Introduced in IDA ICE 4.8
Fixed in IDA ICE 5.0
ASHRAE 90.1 extension: When the Baseline Building is created, exhaust air energy recovery is not included for system 1-4, even if the conditions in Table 6.5.6.1 of the ASHRAE 90.1 2010-standard are met. This leads to an underestimation of the energy use in the Baseline building.
Introduced in ASHRAE 90.1 1.0
Fixed in ASHRAE 90.1 5.0
Detailed window: For a window with a window integrated shading of the type venetian blind or shutter, the solar transmittance may be overestimated and the solar reflectance underestimated, which may lead to a too high cooling and/or a too low heating demand. The error may be of a similar magnitude as a -5 degree error in slat angle might lead to.
Introduced in IDA ICE 4.0
Fixed in IDA ICE 5.0
Detailed window: For windows with a partly IR transmitting shading, e.g. a non-closed venetian blind, the solar gain may be underestimated for an exterior and overestimated for an interior shading. This may lead to too high or too low heating or cooling demand depending on the shading position.
Introduced in IDA ICE 4.5
Fixed in IDA ICE 5.0
Detailed window: When choosing "Wall" as a "Ventilated construction" and having more than a single window on the wall, no error message is given. The model for Ventilated construction is limited to a single inner window.
Introduced in IDA ICE 4.0
Fixed in IDA ICE 5.0
Detailed window: For windows with a high U-value, mainly single pane windows, the heat losses may in some cases become overestimated, which could lead to too high heating demands and/or too low cooling demands in the simulation results.
Introduced in IDA ICE 4.8 SP2
Fixed in IDA ICE 5.0
For a building without external windows the first chosen month's climate data is used for all months when running a cooling or overheating simulation. This might lead to incorrect results.
Introduced in IDA ICE 4.7
Fixed in IDA ICE 5.0
Version Manager: In some cases (mainly in projects with multiple sub-versions) some versions are incorrectly marked as modified after simulation (version name is gray in the project's summary table). The result shown in the project's summary table and the model's summary and details tab can be incorrect for these versions. This can lead to misinterpretation of results.
Introduced in IDA ICE 4.8 SP2
Fixed in IDA ICE 5.0
Driving pressure over leaks and openings is always computed as if the zone was well-mixed. There will be an error for zones with a vertical temperature gradient, i.e. when displacement ventilation or given gradient is used in the Climate zone model.
Introduced in IDA ICE 2.0
Fixed in IDA ICE 5.0